Anyone with advice on caring for young succulents plants and their lighting needs?

Most of my plants are propagated from leaves and still only a few months old. They seem to be stretching as if they have low light. However, if I lift the blinds (they're in a South facing window that receives direct sun 9:30am-4pm) they seem to decline.

I know the sunlight is not actually direct coming through the window glass, but I'm beginning to think the light or heat on my young ones is just too intense for them.